2020年1月北极-中纬度-热带相互作用:与印度地区极端降水的联系

IF 1.9 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Meteorology and Atmospheric Physics Pub Date : 2023-11-22 DOI:10.1007/s00703-023-00998-7
S. D. Sanap, M. Mohapatra, D. R. Pattanaik, S. Sunitha Devi, Satendra Kumar, A. Kashyapi
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引用次数: 0

摘要

2020年1月,北极涛动(AO)的延长正相以及与之相关的准平稳等效正压欧洲-大西洋阻塞高压(EABH)和西伯利亚高压(SH)存在。持续准静止正压高压的存在导致欧亚大陆北部(南部)大部分地区的地表温度高于(低于)正常温度。大尺度分析表明,中纬度西风带从东大西洋绕道至西北太平洋,横贯北非、中东、北印度和中国,形成了西-东槽。从分析中可以看出沿槽区水汽和正对流异常的辐合。在这种大尺度环流异常的背景下,印度中部和北部大部分地区的降水高于正常水平,并伴有雷暴/冰雹事件。AO指数(AOI)和EABH的变化与印度地区降水异常一致。对一个雷暴/冰雹案例的详细分析表明,由于中纬西风带的入侵和大气不稳定的发展以及邻近海域的水分供应,0°C等温线的降低促进了2020年1月雷暴/冰雹事件的发生。
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Arctic–midlatitude–tropics interactions in January 2020: linkages to precipitation extremes over Indian region

The prolonged positive phase of the Arctic Oscillation (AO) and associated quasi-stationary equivalent barotropic Euro-Atlantic blocking high (EABH) and the Siberian high (SH) existed during January 2020. The presence of the persistent quasi-stationary barotropic high resulted in higher (lower) than normal surface temperatures in most parts of northern (southern) Eurasia. The large-scale analysis suggests the detouring of the mid-latitudinal westerlies from EABH and the formation of the west–east trough from East Atlantic to Northwest Pacific across North Africa, the Middle East, North India and China. The convergence of the moisture and positive convection anomalies along the region of the trough is perceived from the analysis. In the backdrop of this large-scale circulation anomalies, higher than normal precipitation was received in most of the central and north Indian regions with thunderstorms/hailstorm events. The variations in the AO index (AOI) and EABH were found to be in concurrence with the precipitation anomalies over the Indian region. The detailed analysis of a selected thunderstorm/hailstorm case suggests that the lowering of the 0 °C isotherm due to the intrusion of mid-latitudinal westerlies and the development of atmospheric instability with moisture supply from the adjacent seas facilitated the occurrence of the thunderstorms/Hailstorm events during January 2020.

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来源期刊
Meteorology and Atmospheric Physics
Meteorology and Atmospheric Physics 地学-气象与大气科学
CiteScore
4.00
自引率
5.00%
发文量
87
审稿时长
6-12 weeks
期刊介绍: Meteorology and Atmospheric Physics accepts original research papers for publication following the recommendations of a review panel. The emphasis lies with the following topic areas: - atmospheric dynamics and general circulation; - synoptic meteorology; - weather systems in specific regions, such as the tropics, the polar caps, the oceans; - atmospheric energetics; - numerical modeling and forecasting; - physical and chemical processes in the atmosphere, including radiation, optical effects, electricity, and atmospheric turbulence and transport processes; - mathematical and statistical techniques applied to meteorological data sets Meteorology and Atmospheric Physics discusses physical and chemical processes - in both clear and cloudy atmospheres - including radiation, optical and electrical effects, precipitation and cloud microphysics.
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